#include "stdio.h"

int main(){
    float average(float array[10]);
    float score[10],aver;
    int i;
    for(i=0;i<10;i++) scanf("%f",&score[i]);
    aver=average(score);
    printf("average score is %5.2f\n",aver);
    return 0;
}

float average(float array[10]){
    int i;
    float aver,sum=array[0];
    for(i=1;i<10;i++) sum=sum+array[i];
    aver=sum/10;
    return aver;
}